Re: find the maxima in a function
- To: mathgroup at smc.vnet.net
- Subject: [mg97088] Re: find the maxima in a function
- From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
- Date: Thu, 5 Mar 2009 04:53:11 -0500 (EST)
- References: <golqus$qai$1@smc.vnet.net>
Your function definition has x as an argument, but apart from x it also depends on y, z and t. With respect to which variable do you want the function to be maximized? If it is t, then you could try something like Solve[D[1/(8*(Pi*t)^(3/2))*Exp[(-(x^2 + y^2 + z^2)/4*t)], t] == 0, t], and you should make a plot or so to check whether this is a local/ global minimum or maximum. You might check FindMaximum and Maximize in the manual. Cheers -- Sjoerd On Mar 4, 2:07 pm, Oliver <sch_oliver2... at yahoo.de> wrote: > Hallo, > how can one find the maxima by using mathematica for the following functi= on: > > f[x_] := 1/(8*(Pi*t)^(3/2)) * Exp[(-(x^2 + y^2 + z^2)/4*t)] > > i mean, the first derivation equal Zero. > Thanks in advance.. > Oli.